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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a863fbd5314b2280cffdbd83513184a1e76b935ac4869d5e425f2168acdb052' 
  AND token = 'lVLuSal7ukxeZ8nJWp6bnCM5LX3fkdaabCcSZIr+VhY=' 
  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"
    }
  }
}