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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3160cd39ecc9bfc87de881d0bac69973b93bc758ba56b055a64439f888e2b80a' 
  AND token = 'dWJY5YDcDh1SrTsRBP+H65FLML8AuLDdpxgGBwN7gYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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