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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553efa9e47ce4d0009ba48ee27a096955b1e6c6fff9396e89c2a7a286f24db5b' 
  AND token = 'SG/9+suIxjIRByg9np8z71NMyh6v0ECEo2/W+DUzh9A=' 
  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"
    }
  }
}