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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe88a2b6879656524953b42430d05e98179c60feb45af8e3a3263a0eac83adf6' 
  AND token = 'JqOffD/eSaoeEN7a+XvfrX3n1/NBgrr+/D5BQ3aQOS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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