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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57332d91058aa8da97bfefe973724fd0d5b90aefdcf5c788d2c3f0dc9e2c792' 
  AND token = 'mbL97qpEiPMYVLpfH5nLpCDYcWVJL81e4zRXcwxHj8o=' 
  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"
    }
  }
}