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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553678bd5efa0d8413b5c89f0f791ea150851806a545f9e3410deaeb1bed711c' 
  AND token = 'mjR0Pe0S38WoD76qzggM1EDKjnWuFGQ/d8J+jnYlpOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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