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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27efa7094531b9f0a27b3652a434433851c634dc99fb7df6e6143f643537ac6b' 
  AND token = 'EvVuXEFcUeabRSGlgc7Ol1N3a+Wn3HMcsiMIlQ5TgnM=' 
  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"
    }
  }
}