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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc303f86c69fd699a7ec3442f7db8b8edb32d56551571d45dc30bcd8dc18d895' 
  AND token = '026Lw4n5hoO8APx6uXBuNFMezgs7SabnQd3Q1JzK054=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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