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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4577e8392831e7434cc077783e528f56489ec81cca4171ba0114aefc19c42b5a' 
  AND token = 'liHEooh21eNArGP9nCwt/blBQ5kquu672nmEhBl8438=' 
  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"
    }
  }
}