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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c11324b9c945ac70a18dd0b1feaf3c16c0a0a5d083849117d4d0bfb817f4c2' 
  AND token = 'kg/Cyh8ecc/cLwtu/p4VIfOj02KqwyYVbubJ9BTHaoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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