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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa730782fbdf8b9f2f9f689b25b7deae0ab2a2bbe5fce2654234520b13ae4e7b' 
  AND token = 'GZihf3aBaLAoHGjFFDBOz8j6byjTi8VpQ1F6JPqOmNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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