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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8b8f9d743ec0e42fa1cd25340d906b4075a7015d3701bca594031b4e5c5a60' 
  AND token = '/6LY23aZENtkJFDOZ2YT7AMGXPiYjAfxk1m/H9oE+C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}