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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69474a371b34a2a3d566adcef5fcb29c9d968d0bea320ae749a63354e1fdcfd' 
  AND token = 'hW5hch+q7LHwwUQ7bITjQqfhjFuzodWEXEvs2RXMhW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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