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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5701898a112c28879e1854aa0f2a1d02f1c18605fd77cbe9ca719aa2cfd7bdfc' 
  AND token = 'muK4q5traCDcF+MjbLEWX8/WwNXsamwflrQ1tlv1jdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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