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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c5db8bd1a521961825ccecb2681655fdfde61fe9fefe6e5cd2dda87f6d2096' 
  AND token = '1eaCY1CZ9i9bSPoDXhhRJ+xloSUXsI8hKl/uQ3v3OKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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