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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f29e814f4f6c0ad99183f9961b942cc39cf4211c1aa5b0e8f4d959a0ec8114c9' 
  AND token = '+aM23m4/Q9QnxsuCKgTW5U9zoBpnWPgtn+VzHCXI+0g=' 
  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"
    }
  }
}