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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b465a5a8630b308a6e1f0c84f1b30bd0ffcf461b3a1a192fec35c6d098111c' 
  AND token = 'XTmEZ35C+vnGW2Qn9nnq6arCtVvvo0F4r9lnesuWTlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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