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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96cd3f9eb1945e00661e256886185ac9c4b413f69b55a0ef3c6a9070b996c7d3' 
  AND token = 'IKZzJ6owKycQJPUSUntsKbjbrdY5W9nVtioWHEbyiIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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