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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f155d40b72dcb0c3cbb84642a225c76c90e427a16300733b3b30394d4fea001' 
  AND token = 'xi2Cg0JNTQUkQdy0XnG+eTffTHPzalu/xKR8Pv/Ia2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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