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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbcbfb0f3dc9872164e5d9910b244469b6b228505f2c80292d1d0963d9246d2' 
  AND token = '11jLUz5d1A8yVqMQUTYq/ra1+XT1V3VdN661IPnRaS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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