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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d035c7800d47814887c2c19adfcc53344f3aaf417fe998ea36f5280901f8eb' 
  AND token = '6BMF+0gGFfccwAhwIjVkIPdct7Rhufv1fB4K0hnbaK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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