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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb86ed7c368048fd8f11efb80ad9dfcbeaf03e4d71d57095b1875ae8a1fdbab' 
  AND token = 'RfLM713/ZOtNBH01r9R5PDE5JYILaH1pKx6GvpLTPwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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