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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebc76829af30f1865bb7034fcdbdf48090ed2f0b4a72e3ce4b36a0e58e21bf9' 
  AND token = '6RIzplN6+EjPSMmIXNzLkl1qK9paprsZ4AoMFCJRkaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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