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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3417b5dfe084c5aea4b26ecd5400c1cbf1f68f095a45685f335c3afe8a4f5a' 
  AND token = 'OYhrRgqkqa6FZr4WIEOqm/DkelF8+kE5csAFBndunf0=' 
  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"
    }
  }
}