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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ab1c56fe99cef91ef7a882fb8d0182885930624e7cb66c075b9dcd875c368c' 
  AND token = '80vfyAnYZI4ukc7eX9wJjDR/bE8BAKaRfGuEOCNIdaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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