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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d19f8a85ac854acd534933358b65f4fc393c8fe26aca220c95745fbc636f0ab' 
  AND token = 'GXET9ybZWVkVgqC0Jv6Edm11nYK0nuL3oBnrB+L0tWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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