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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d77c18ee66d10d24fed56bc4c20708d2c5e68d3a5f0cc805400f838a656ba3a' 
  AND token = 'o1cBfxaVXu93WKnhWUvJRItX3V/2w3es5CT7S0TSqYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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