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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eccd4825c9edc679962acf87592bbfc71d00c32c8d186ce9969c3af41d6142aa' 
  AND token = 'F6K/ff2wL/4gfHeARGP7z3C3/dnCT/Nxh77j+ISZs4I=' 
  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"
    }
  }
}