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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6d7a11fd94e6232136fd0fe3ad8e3889c40d0e57ea43340857dad6fa7d6cbd' 
  AND token = 'le/DWIs6+5Q8nqYSWpZK0ATResNkxf1rTpHegSFMhL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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