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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2432fdbd459f8a73fe71281a11d92c996f0158bac4391b57352d4872d9240e5' 
  AND token = '4n4BaCr4cwAGzt2/ECdq2tBMA7Q5Z1EDSCwBFTOYH+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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