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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b474be73f34a40dfa49b29953ae0b0c04e7f9c044fcfec371b5909f47719812a' 
  AND token = 'tYelVntkDqBqgj/B72lUk9PC4nta/nhaLPz5QOdvQNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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