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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2e0866310ccd05996a0d41b910d3b18e2ac1a128b7b62add79c4ef0a64e051' 
  AND token = 'ks+FDavn8AkrasUWNe1YBd42qURQBA5r/TRSdzG5woQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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